Designing method for single-phase intelligent ammeter power transformer

Abstract

The invention discloses a designing method for a single-phase intelligent ammeter power transformer based on an EI type insert iron core. According to the designing method for the single-phase intelligent ammeter power transformer, output voltage and current meet index requirements, besides, the size is small, and temperature rise is low. The designing method is based on references New electronic transformer handbook, written by Quanbao Wang, Liaoning science and technology press, June 2007; from the step S1 to the step S13, an integrated round copper wire gage list is added, so that the current carrying capacity of copper wires of the selected sizes and specifications is judged, and wire selection errors are avoided. In addition, the number of turns of a secondary coil of a transformed designed for the first time may not meet the voltage output index requirements, and output voltage cannot meet the index requirements unless the number of the turns of the secondary coil is adjusted properly; a method for adjusting the number of the turns of the secondary coil is put forward in the step S14 and the step S15, and in terms of the selection principle of decreasing or increasing the number of the turns, the number of the turns is decreased or increased according to the average value of all secondary floating voltage and load voltage errors; finally, from the step S16 to the step S18, recalculation is performed on the transformer. Accordingly, the output voltage and current of the intelligent ammeter power transformer can meet the index requirements, and meanwhile the intelligent ammeter power transformer is small in size and low in temperature rise.

Description

technical field [0001] The invention relates to a transformer, in particular to a design method of the transformer. Background technique [0002] EI-type blade core power transformer has simple structure and low cost. EI-type blade core and its supporting coil bobbins and clip frames have been formed into series and mass-produced. It is the most widely used core structure form in civil electronic equipment. Therefore, the power transformer of the intelligent electric energy meter of the present invention also adopts the EI type insert iron core. [0003] Wang Quanbao's "New Electronic Transformer Handbook" is the design basis commonly used by transformer designers at present, that is, the reference: Wang Quanbao. New electronic transformer manual. Liaoning Science and Technology Press, 2007.6. The design methods of various transformers are described in detail, but before the final voltage calculation, the current carrying capacity of the copper wire of the selected specif...

AI Technical Summary

Problems solved by technology

If the current carrying capacity of the selected copper wire is smaller than the actual current, the temperature rise of the transformer may be too high, and the transformer may burn out during long-term operation.

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